From: | Hannu Krosing <hannu(at)skype(dot)net> |
---|---|
To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
Cc: | Gregory Maxwell <gmaxwell(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Support Parallel Query Execution in Executor |
Date: | 2006-04-09 08:58:06 |
Message-ID: | 1144573086.3657.3.camel@localhost.localdomain |
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Lists: | pgsql-hackers pgsql-patches |
Ühel kenal päeval, L, 2006-04-08 kell 18:47, kirjutas Luke Lonergan:
> I agree - there is a real continuing need for overlapped scan and execution,
> though I'm not sure quite how to get it efficiently using inter-process
> communication. The AIO interface is nicely proven at this point, but to
> Tom's point, it's non-portable.
>
> What we see now is that the executor is CPU bound at about 300MB/s scan rate
> using modern Opteron CPUs.
Where exactly does the CPU spend its time at 300MB/s ? Is it mainly I/O
related processing, processing pages into in-memory tuples or something
else ?
--------------
Hannu
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